The custom claims provider in your server farm is activated for all the Web Applications by default as it has to be globally deployed. This may cause you an issue if you are using FBA on another Web Application and would return users even though the authentication provider is not your custom Trusted Claims provider. […]

This is a very common requirement at every client using the FBA or Trusted Claims provider for their Extranet Sites. The issues with enabling search are commonly as below: The login page if its redirected to authentication the STS of the authenticating provider like Windows Live ID or Facebook If the Active Directory is enabled […]